Air is trapped in a piston - cylinder machine. initially P1 100 Kpa V1 210-2 m3 . The spring

Air is trapped in a piston - cylinder machine.
initially P1 100 Kpa V1 210-2 m3 .
The spring exets no force on the piston in the initial position.
The atmospheric pressure is 100 kpa and area of the piston is 0.018 m2.
The air expands slowly till its volume is V2 310-3 m3 .During the process the spring exerts a force on the piston F-KX where K 16.2 103Nm.
neglecting any friction between piston and cylinder wall determine the final pressure of air and the work done by the air on the piston solution of pk nagg solved example 3.3 yogimechanics

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